Read More:
Apollo 12: The Pinpoint Missionhttps://www.nasa.gov/mission_pages/apollo/missions/apollo12.html
“The primary mission objectives of the second crewed lunar landing included an extensive series of lunar exploration tasks by the lunar module, or LM, crew, as well as the deployment of the Apollo Lunar Surface Experiments Package, or ALSEP, which was to be left on the moon’s surface to gather seismic, scientific and engineering data throughout a long period of time.”

45 Years Since Apollo 12: The $500 Bet and the Lightning Strikehttp://www.americaspace.com/?p=44713
“In early 1969, many within NASA were convinced that Apollo 12, not Apollo 11, was most likely to accomplish humanity’s most exalted goal of the 20th century. It seemed inconceivable that the Apollo command, service, and lunar modules, and the Saturn V booster, together with such complexities as Lunar Orbit Rendezvous and the descent and landing profile to the Moon, could possibly be accomplished in just a few months.”